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| INFLUENCE OF AGING ON THE HARDENABILITY OF 7055 ALUMINUM ALLOY THICK PLATE |
| LIU Shengdan, LI Chengbo, DENG Yunlai, ZHANG Xinming |
| Key Laboratory of Nonferrous Metals, Ministry of Education, School of Materials Science and Engineering, Central South University, Changsha 410083 |
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Cite this article:
LIU Shengdan LI Chengbo DENG Yunlai ZHANG Xinming. INFLUENCE OF AGING ON THE HARDENABILITY OF 7055 ALUMINUM ALLOY THICK PLATE. Acta Metall Sin, 2012, 48(3): 343-350.
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Abstract The influence of aging on the hardenability of 7055 aluminum alloy thick plate was investigated by means of end-quench test, optical microscopy (OM), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and differential scanning calorimetry (DSC). The results show that the hardenability can be improved by long time natural aging before artificial aging. The hardened depth is about 78 mm after natural aging and only about 45 mm after artificial aging, but increased to be about 100 mm after natural and artificial aging. During slow quenching, the coarse η equilibrium phase forms, and the solute concentration and vacancy concentration are decreased, which lead to larger and fewer η' hardening precipitates, thus lower hardness after aging. The long time natural aging before artificial aging is favorable for formation of stable GP zones at slowly-cooled locations, and consequently more amount of dispersed and fine η' hardening precipitates, which give rise to higher hardness and simultaneously better hardenability.
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Received: 10 August 2011
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| Fund: Supported by National Basic Research Program of China (No.2012CB619501) and the Freedom Explore Program of Central South University (No.201012200238) |
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